Kinematics (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 36  38 of 233
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Question number: 36
» Kinematics » Average Speed and Instantaneous Velocity
Assertion (Ꭺ)
The magnitude of velocity of two boats relative to river is same. Both boats start simultaneously from same point on the bank may reach opposite bank simultaneously moving along different paths.
Reason (Ꭱ)
For boats to cross the river in same time. The component of their velocity relative to river in direction normal to flow should be same.
Choices
Choice (4)  Response  

a.  Ꭺ is true but Ꭱ is false 

b.  Ꭺ is false but Ꭱ is true 

c.  Both Ꭺ and Ꭱ are false 

d.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

Question number: 37
» Kinematics » Average Speed and Instantaneous Velocity
Question
the distance between two particles is decreasing at the rate of 6 m/sec. If these particles travel with same speeds and in the same direction, then the separations increase at the rate of 4 m/s. The particles have speeds as
Choices
Choice (4)  Response  

a.  4 m/sec; 1 m/sec 

b.  5 m/sec; 1 m/sec 

c.  4 m/sec; 2 m/sec 

d.  5 m/sec; 2 m/sec 

Question number: 38
» Kinematics » Motion in a Straight Line
Question
A particle of mass m moves on the xaxis as follows: it starts from rest at t = 0 from the point x  0 and comes to rest at t = 1 at the point x = 1. No other information is available about its motion at intermediate time (0 < t < 1). If a denotes the instantaneous acceleration of the particle, then
Choices
Choice (4)  Response  

a.  A cannot remain positive for all t in the interval 0 < t < l 

b.  Must be > 4 at some point or points in its path 

c.  Cannot exceed 2 at any point in its path 

d.  = 2 at any point in its path. 
